"One Day at a Time" cast members, (clockwise from top)... Photo-4268262.57679 - Times Union

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"One Day at a Time' cast members Mackenzie Phillips as Julie Cooper Horvath, Bonnie Franklin as Ann Romano Royer and Valerie Bertinelli as Barbara Cooper Royer.

"One Day at a Time' cast members Mackenzie Phillips as Julie Cooper Horvath, Bonnie Franklin as Ann Romano Royer and Valerie Bertinelli as Barbara Cooper Royer.

Photo: CBS Photo Archive, Getty

"One Day at a Time' cast members Mackenzie Phillips as... Photo-4268264.57679 - Times Union

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"One Day at a Time" cast members (clockwise from upper right) Pat Harrington, Jr. as Schneider, Valerie Bertinelli as Barbara Cooper, Bonnie Franklin as Ann Romano Royer, Mackenzie Phillips as Julie Cooper and Richard Masur as David Kane. less

) Actors Bonnie Franklin, Pat Harrington Jr, Mackenzie Phillips and Glenn Scarpelli attend the 10th Annual TV Land Awards at the Lexington Avenue Armory on April 14, 2012, in New York City. (Photo by Charles Eshelman/FilmMagic) less

) Actors Bonnie Franklin, Pat Harrington Jr, Mackenzie Phillips and Glenn Scarpelli attend the 10th Annual TV Land Awards at the Lexington Avenue Armory on April 14, 2012, in New York City. (Photo by Charles ... more

Valerie Bertinelli and Bonnie Franklin attend TV Land's "Hot In Cleveland" and "Retired At 35" Premiere Party at Sunset Tower on January 10, 2011, in West Hollywood, Calif. (Photo by Jeff Kravitz/FilmMagic)

Valerie Bertinelli and Bonnie Franklin attend TV Land's "Hot In Cleveland" and "Retired At 35" Premiere Party at Sunset Tower on January 10, 2011, in West Hollywood, Calif. (Photo by Jeff Kravitz/FilmMagic)